Conference Agenda

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Session Overview
Session
TECH2
Time:
Tuesday, 05/July/2022:
11:00am - 12:30pm

Session Chair: Jan TYWONIAK
Location: Hall B


Innovative technologies and systems

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Presentations
11:00am - 11:15am

Effect of Heated Facade Air on the Results of Climate Data Measurement

Peter KYSELA, Radoslav PONECHAL, Ján RYBÁRIK

Faculty of Civil engineering - University of Žilina, Slovak Republic

Measuring climate data is a lengthy and technically challenging task. To record temperature data, small meteorological stations are located on the facade of the Research Centre building. Due to the position of the meteorological stations, which are mounted directly on the facade of the building, the temperature measurement sensor is not only affected by the solar radiation falling on the sensor housing, but also by the solar radiation falling on the facade of the building. The illuminated surface of the facade gradually heats up during the day and warms the air flowing near the facade. The temperature readings during the day may therefore be significantly distorted. To avoid this phenomenon, better-quality radiation shields have been purchased. The new radiation shield is characterized by a design that resembles eddy currents. The relationship between the shape of the outer and inner spiral is optimized, allowing vortices to form even in virtually windless conditions. In this paper, we would like to point out the differences in the measured air temperature data, according to the radiation shield used and the distance of the temperature sensor from the building facade.



11:15am - 11:30am

Twin Rooms – New Experimental Test Facility for Testing Advanced Facade Elements

Boris BIELEK, Daniel SZABO, Josip KLEM, Kristina KANIKOVA, Alzbeta DANKOVA

Slovak University odf Technology in Bratislava, Faculty of Civil Engineering, Slovak Republic

Nowadays the global trend is the integration of new materials, constructions and technological principles, which are simultaneously implemented in individual scientific and engineering disciplines. Reducing the energy intensity of buildings will increasingly resonate in individual political and professional circles. As a result, new fragments of building envelopes in the field of facade engineering are being developed and tested. Testing of building envelope is carried out either in static (laboratory) boundary conditions or in dynamic (real) conditions. Currently, we are finishing the development and realization of the new experimental facility Twin Rooms for testing advanced elements of building envelopes in real dynamic boundary conditions in terms of building thermal engineering and energy efficiency of buildings. It is based on the concept of pavilion measurement. The essence of the research is that the outdoor climate is modeled by the conditions of the real outdoor climate. Test facility consists of a solar laboratory - two-rooms for a comparative study of the effect of solar radiation and heat transfer on energy consumption and indoor climate. The space of two identical laboratory rooms is situated inside a pavilion, whose climate is a compensating space. Only the tested facade element wall are exposed to the outdoor climate. The exchange of energy with the environment is possible only through this measured facade wall. The article brings a detailed description of this experimental equipment, basic technical parameters of its technological circuits and methodology of experimental measurements.



11:30am - 11:45am

Experimental Monitoring of Autonomous Curtain Walling Facade Module

Vojtěch ZAVŘEL1,2, Tomáš MATUŠKA2, Petr SLANINA3

1Czech Technical University in Prague, Faculty of Mechanical Engineering, Department of Environmental Engineering, Technická 4, 166 07 Prague 6, Czech Republic; 2Czech Technical University in Prague, University Centre for Energy Efficient Buildings, Department of Energy Systems in Buildings, Třinecká 1024, 273 43 Buštěhrad, Czech Republic; 3WIEDEN s.r.o., Do Čertous 2830/2, 193 00 Prague, Czech Republic

Paper presents an innovative concept for autonomous curtain walling façade module that integrates functions of heating and cooling as well as renewable energy storage and generation to achieve a certain level of self-sufficiency in energy supply for typical adjacent office. The prefabricated facade module consists of three sections, two opaque and one transparent (window with shading device). The main components applied in the module are: Peltier chiller-heater (designed cooling power 400 W), PV modules (920 Wp) integrated into exterior surface of the facade and flat-plate LiFePO4 battery (3,1 kWh) integrated into interior surface of the module. Autonomous curtain walling façade module at size 3 x 3 m has been designed, built and installed at testing cell. Paper presents the results from the detailed monitoring during season 2020/2021, especially on-site energy fraction (OEF) and on-site energy matching (OEM) but also efficiency of Peltier cells in real operation and interior thermal conditions in the adjacent office achievement.



11:45am - 12:00pm

Measurement and CFD Analysis of a Local Radiant Cooling Solution

Shiva NAJAF KHOSRAVI, Helene TEUFL, Ardeshir MAHDAVI

Department of Building Physics and Building Ecology, TU Wien, Karlsplatz 13, 1040 Vienna, Austria

This paper entails an empirical and computational assessment of the air flow field in the close proximity of a vertically positioned radiant cooling panel. This radiant cooling solution differs from the conventional large-area radiant cooling systems (e.g., ceiling panels). It involves rather small-sized vertical panels positioned close to occupants. Moreover, the panels are designed so as to manage potential surface condensation of water vapor via integrated drainage elements. Hence, the panels can be operated with relatively low surface temperatures. The low panel surface temperature and its proximity to the occupants are intended to compensate for the potential lower cooling power due to the relatively small panel size. In this paper, we specifically explore the air flow field close to the local radiant cooling panel via laboratory measurements and CFD simulations. Thus, possible issues regarding discomfort due to draft and turbulence risk close to the radiant panel can be examined. To this end, a prototypical local radiant cooling panel was installed in a mock-up office room of a laboratory. The ambient air temperature and relative humidity in the room were kept at 30±0.5°C and 40±3%, respectively. During the experiments, the target panel surface temperature was 10°C. The air flow speed was measured and simulated at several heights (between 10 and 110 cm from the floor) and distances (ranging from 1 to 50 cm from the radiant panel). The results allow for the evaluation of the draft discomfort risk as well as the reliability of CFD in reproduction of the measurement results.



12:00pm - 12:15pm

Critical Analysis Of Monitoring Indoor Air Quality In Education Centres

Anna FIGUEROA-LÓPEZ, Xabat OREGI, Alexander MARTÍN-GARÍN, Rufino J. HERNÁNDEZ-MINGUILLÓN

CAVIAR Research Group, Department of Architecture, University of the Basque Country, Plaza Oñati 2, Donostia-San Sebastián, 20018, Spain

Indoor Air Quality perception in education centres has being a special concern based on their high occupancy and lack of ventilation. This study aims to present an overview of 20 relevant previous studies carried out in the last 5 years regarding monitoring and evaluating Indoor Air Quality in education centres. This analysis focuses on four specific aspects: general description of each study, ventilation typology, indicators measured and the number of locations measured. The results show that 60% of the studies were located in an urban context, 75% included primary schools and 75% included naturally ventilated buildings. Indoor and outdoor was measured in 60% of the studies. The most measured indicators were CO2 (60%), PM2,5 (55%), Temperature (50%) and Relative Humidity (40%) all indoor. In 60% of studies were carried in more than five centres, mostly two rooms were measured and 35% of studies placed one sensor per room. This can be a major limitation, as the monitored data may differ significantly from the actual situation. In conclusion, the greater correlations found relating to what indicators have been measured, were the ventilation typology and the location of the building, which influences what parameters and concentration can be expected.



 
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